Li Ying-Hong, Wang Xiang-Yun, Hua Wei, Zhang Hu
Zhejiang Institute for Food and Drug Control, NMPA Key Laboratory for Testing and Warning of Pharmceutical Microbiology, Hangzhou 310052, China.
Agricultural Ministry Key Laboratory for Pesticide Residue Detection, Zhejiang Province Key Laboratory for Food Safety, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
J Anal Methods Chem. 2020 Nov 4;2020:8874759. doi: 10.1155/2020/8874759. eCollection 2020.
Indoxacarb is a broad-spectrum insecticide and widely used in agriculture. The dissipations and residues of indoxacarb were researched at three different field sites in Beijing, Hunan, and Zhejiang provinces in China. Analytical methods for determining the residue of indoxacarb in paddy water, paddy soil, rice straw, rice hull, and brown rice were described. Indoxacarb residues were extracted from samples, cleaned up by solid phase extraction, and determined by high-performance liquid chromatography coupled with tandem mass spectrometry in the selected ion monitoring mode. The recoveries in paddy water, paddy soil, rice straw, rice hull, and brown rice matrices at three spiking levels ranged from 79.7% to 98.3%, respectively. The field and environmental conditions would affect the dissipations and residues of indoxacarb. The time to dissipate 50% of indoxacarb in paddy water, paddy soil, and rice straw was less than 9 days. The terminal residues obtained from Beijing at preharvest interval of 14 and 21 days were higher than the maximum limit of European Union. Therefore, a dosage of 24 g a. i. ha at 28 days preharvest interval with 3 spraying times was recommended. Such accumulation of measured data is necessary to provide guidance for the proper and safe use of this pesticide.
茚虫威是一种广谱杀虫剂，在农业中广泛使用。在中国北京、湖南和浙江的三个不同田间地点研究了茚虫威的消解和残留情况。描述了测定稻田水、稻田土壤、稻草、稻壳和糙米中茚虫威残留量的分析方法。从样品中提取茚虫威残留，通过固相萃取进行净化，并采用高效液相色谱-串联质谱法在选择离子监测模式下进行测定。在三个加标水平下，稻田水、稻田土壤、稻草、稻壳和糙米基质中的回收率分别为79.7%至98.3%。田间和环境条件会影响茚虫威的消解和残留。茚虫威在稻田水、稻田土壤和稻草中消解50%的时间不到9天。在北京收获前间隔14天和21天获得的最终残留量高于欧盟的最大限量。因此，建议在收获前间隔28天施药剂量为24克有效成分/公顷，喷雾3次。积累这些测量数据对于指导该农药的正确和安全使用是必要的。
